Publisher: Hertie

Hertie was a German department store chain, and the site lists it among the sellers of one Atari 2600 cartridge: Bermuda. The game inside is Activision’s River Raid under another name. You fly a jet up a river, shoot ships, helicopters and bridges, and refuel by flying over fuel depots. The same cartridge was also sold by Suntek under the Rainbow Vision label.
You can try Bermuda below, right in your browser.

Bermuda

Bermuda is an unofficial release of Activision’s River Raid under a different name. It was sold by Suntek under the Rainbow Vision label (model SS-009) in PAL countries, and a version with a Taiwanese “Cooper” label is also known. Emulator databases list Bermuda simply as River Raid, so what you play here is Carol Shaw’s 1982 river shooter with a new name on the label. You can play it here in your browser.